Research On Solar Thermochemical CO₂ Decomposition Characteristics In Fe₃O₄ Porous-filled Reactor

The utilization of solar thermochemical decomposition of carbon dioxide could both achieve the solar energy utilization and carbon dioxide emissions.Solar thermal chemistry could overcome the shortcomings of solar energy,such as low energy density,uneven distribution,weathere affected and et al.Solar thermochemical catalysts are the key to achieving solar thermochemical reactions.How to design the structure of the catalyst and prepare high-efficiency catalysts is of great significance to improve the efficiency of solar energy conversion into chemical energy.The research content of this paper could be divided into two parts:high temperature solar thermochemical numerical simulation and solar thermal chemical decomposition carbon dioxide cycle experiment.High-temperature solar thermochemical numerical simulation was carried out according to the actual size of the fabricated solar thermochemical reactor.The effects of operating conditions and Fe₃O₄ porous catalyst structure parameters on reactor temperature and carbon dioxide conversion rate were studied and analyzed.Furthermore,the numerical simulation results were used as a reference for following experiments.A solar thermochemical reactor was designed and manufactured based on the existing focused solar simulator,and with reference to related literatures.The effects of diffuse irradiation intensity,gas inlet velocity,porosity and average cell size of porous catalyst on reactor temperature distribution and carbon dioxide conversion were simulated and calculated.Moreover,the optimal operating conditions and porous catalyst structural parameters were obtained.Based on the optimal porous structure parameters,which were obtained by numerical simulation,a surface-coated Fe₃O₄ porous catalyst was prepared.The solar thermochemical decomposition carbon dioxide cycle experiment was carried out using the surface-coated Fe₃O₄ porous catalyst.However,the cycle experiment efficiency was unsatisfying.Therefore,a porous catalyst with Fe₃O₄/Al₂O₃ as raw material was designed and the related cycle experiments were carried out.The experimental results illustrate that the new catalyst could improve the cycle efficiency of thermochemical decomposition of carbon dioxide.The purpose of this study is to improve the cycle efficiency of the laboratory scale solar thermochemical decomposition of carbon dioxide experiment.Furthermore,it could provide reference for the practical utilization of solar thermochemistry.